<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区-->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="">
      </div>
      <!--表单区间-->
      <el-form ref="loginFormRef" :model="loginForm" label-width="0px" :rules="loginFormRules" class="login_form">
        <el-form-item prop="username">
          <el-input prefix-icon="iconfont icon-user" v-model="loginForm.username"></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input prefix-icon="iconfont icon-3702mima" v-model="loginForm.password" type="password"></el-input>
        </el-form-item>
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="restLoinForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>
<script>
  export default {
    data () {
      return {
        loginForm: {
          username: '',
          password: ''
        },
        loginFormRules: {
          username: [
            //验证用户名是否合法
            {
              required: true,
              message: '请输入用户名',
              trigger: 'blur'
            },
            {
              min: 3,
              max: 5,
              message: '长度在 3 到 5 个字符',
              trigger: 'blur'
            }
          ],
          //验证密码是否合法
          password: [
            {
              required: true,
              message: '请输入密码',
              trigger: 'change'
            },
            {
              min: 3,
              max: 15,
              message: '长度在 6 到 15 个字符',
              trigger: 'blur'
            }
          ]
        }
      }
    },
    methods: {
      restLoinForm () {
        //在表单中定义ref引用
        this.$refs.loginFormRef.resetFields()
      },
      //表单提交之前的预验证
      login () {
        this.$refs.loginFormRef.validate(
          async (valid) => {
            if (!valid) return
            const { data: res } = await this.$http.post('login', this.loginForm)
            //默认返回promise对象，将data属性，重新命名为res，为真实的服务端返回的结果
            console.log(res)
            if (res.meta.status !== 200) return this.$message.error('登录失败')
            this.$message.success('登录成功')
            //1、登录成功之后token，保存到客户端的sessionStorage中
            //1.1 项目中除了登录之外的其他Api接口，必须在登录之后才能访问
            // 1.2 token只应该再当前网站打开期间生效，所以讲Token保存在sessionStorage中
            //2. 通过编程式导航跳转到后台主页，路由地址是 /home
            window.sessionStorage.setItem('token', res.data.token)
            this.$router.push('/home')
          }
        )
      }
    }
  }
</script>
<style lang="less" scoped>
  .login_container {
    background-color: #2b4b6b;
    height: 100%;
  }

  .login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);

    .avatar_box {
      height: 130px;
      width: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      background-color: #fff;

      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
      }
    }
  }

  .login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }

  .btns {
    display: flex;
    justify-content: flex-end;
  }
</style>
